阳极
材料科学
功率密度
电解质
化学工程
储能
电极
光电子学
纳米技术
化学
功率(物理)
热力学
物理
工程类
物理化学
作者
Yufeng An,Zhiwei Li,Yao Sun,Shaopeng Li,Yinghong Xu,Hui Dou,Xiaogang Zhang
标识
DOI:10.1002/batt.202200036
摘要
Abstract Harvesting heat from the low‐grade heat (below 100 °C) into electricity has the signification to enhance the utilization of energy and lower carbon emissions by a simple device. Herein we demonstrate a thermally chargeable ammonium ion capacitor (TAIC) by employing graphene‐polyimide (rGO‐PI) synthesized through polycondensation of 1,4,5,8‐naphthalenetetracarboxylic dianhydride and ethylenediamine as cold electrode, N‐doped hollow carbon nanofibers as hot electrode to directly convert waste heat into electricity. Combining thermodiffusion effect of electrolyte with thermogalvanic effect of a redox couple (−C=O/−C−O−NH 4 + ), as‐assembled TAIC can deliver a high output voltage of 624 mV, power density of 82 μW cm −2 and average Seebeck coefficient of 9.07 mV K −1 at temperature difference of 45 K. Meanwhile, with the introduction of polyacrylamide‐polyacrylic acid‐based gel electrolyte, the assembled flexible device can well serve in various bending states, and the power density can attain a satisfying value of 1.92 μW cm −2 . This quasi‐solid‐state TAIC shows great potential as one promising candidate for high value‐added conversion from low‐grade heat into electricity as well as wearable applications.
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